Ingot mold



oct. 25, 1932. E, SCHRER 1,884,291

l INGoT MOLD rma ec. 16. 1930 Patented Oct. 25, 1932 UNIT-ED STA-'rss PATENT OFFICE EUGEN scntrnnn, or concerts-Humm, aannam?, assmnon 'ro GUIL- Lmtmn cmswmanniv-GESELLSCHAFT, or comenta-nume nmol' norm appuuuo ma mpeg 1e. mo, semi no. ma, ma m sammy muy sa, ma.

alloys, for instance certain -ium alloys, itis in some cases desirable for the castmass to solidify as slowly as possi-ble so 5 as to obtain a fine-grained structure. with i this object in view, it has alread been proposed to use ingot molds made o a material.

which is a very bad heat conductor, 'for instance of an iron-nickel alloy contammg about 35% of nickel and known in the tradeA under the name of invar. It has been found, however, that, when invar '1s used as the material for the ingot mold', the cast material still contains many needle-like crystals.

I5 lExperiments have now shown that this coarse ray-like structure is due tothe invai radiating too much heat to the outside.

According to the invention the invar ingot molds are enclosed in a sheath made of a material which has a very slight heat radiation,

-at least one that is poorer than that of the invar. The rovision of such a sheath results in a s cientl slow solidiiication and l consequently in t e" desired fine-grained name to this specification.

structure of the cast material. l

The accompanyingx drawing shows a constifuctional form of t e ingot mold according to the'invention. The inner part a of the ingot mold consists of invar, and the sheath $0 b placed 'on its outer coggr.

at I claim is 1. An in ot mold for casting zinc'andalusurface of a material Y having a very low heat radiation, for instance and an outer sheath consisting of a material 40 the surface of which has a lower heat radiation than the said inner part.

2. An in ot mold for casting zinc and aluminium oys which should solidify slowly so as to obtain a fine-grain structure, comprising in combination an inner part consisting of EUGEN seni-mns..

When -casting metals, -mcre narticularly an iron alloy containing aboutv 35% of nickelA zinc and aluminand a thin outer sheath consisting of co per.

In testimony whereof I have sign my 

